The very purpose of history is to gather up what is about to be lost for ever. Between 500,000 to 2 million people died in the Cultural Revolution. Yet a silence remains as to why. Over eleven years in Mao's China, an all-out assault on 'class enemies' took place. Teenagers smashed their teachers' skulls. Doctors were tortured in jail as foreign spies. Ordinary people condemned 'counter-revolutionaries' to execution--and then went home and ate their...